Prosecutor won't charge Washtenaw County sergeant in sexual assault investigation

The decision follows a Michigan State Police probe involving two Washtenaw County Sheriff's Office deputies.

Mar. 10, 2026 at 6:40pm

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The Washtenaw County Prosecutor's Office has confirmed it will not bring charges after a criminal sexual conduct investigation involving a county sheriff's office sergeant. The investigation was referred to state police and involved two deputies. The sergeant, Jeremy Yono, was placed on administrative leave but has since resigned from the sheriff's office. County officials cited the investigation as one of the reasons they moved to take control of the sheriff's Human Resources Department, leading to a lawsuit from the sheriff that is still pending.

Why it matters

The case highlights tensions between the Washtenaw County Sheriff's Office and the county board of commissioners over management of the department's internal affairs. The prosecutor's decision not to file charges against the sergeant raises questions about the nature of the allegations and the ongoing legal dispute between the sheriff and county leaders.

The details

The Michigan State Police confirmed it investigated a sexual assault allegation involving two members of the Washtenaw County Sheriff's Office in September 2025. The investigation was then handed over to the county prosecutor's office, which ultimately opted not to issue charges. The sergeant, Jeremy Yono, was placed on administrative leave but has since resigned from the sheriff's office. County officials cited the investigation as one of the reasons they moved to take control of the sheriff's Human Resources Department, leading to a lawsuit from the sheriff that is still pending.

  • The investigation by Michigan State Police occurred in September 2025.
  • The Washtenaw County Prosecutor's Office announced its decision not to file charges on March 9, 2026.

The players

Washtenaw County Prosecutor's Office

The office that decided not to bring charges after the criminal sexual conduct investigation.

Sgt. Jeremy Yono

A Washtenaw County Sheriff's Office sergeant who was the subject of the sexual assault investigation and has since resigned from the department.

Washtenaw County Sheriff Alyshia Dyer

The first-term sheriff who sued the county board of commissioners after they moved to take control of the sheriff's Human Resources Department, citing the investigation as one of the reasons.

Washtenaw County Board of Commissioners

The county leaders who voted to move control of the sheriff's HR department to the county, citing "widespread reports of misconduct and detrimental internal operations" in the sheriff's office.

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What they’re saying

“He has not committed any crimes whatsoever, and that has been borne out by the investigation.”

— Dan Geherin, Attorney for Sgt. Jeremy Yono

“Although the MSP investigation has been completed, our internal investigation is still ongoing, and we will not comment further as our internal process has not yet been completed.”

— Crystal Campbell, Washtenaw County Sheriff's Office spokesperson

What’s next

The legal case between the Washtenaw County Sheriff and the county board of commissioners remains pending in Jackson County Circuit Court.

The takeaway

This case highlights the ongoing tensions between the Washtenaw County Sheriff's Office and county leadership over issues of internal discipline and management. The prosecutor's decision not to file charges raises questions about the nature of the allegations, while the county's move to take control of the department's HR functions has led to an unresolved legal battle.